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diff --git a/guix/import/gnu.scm b/guix/import/gnu.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix import gnu)
+  #:use-module (guix gnu-maintenance)
+  #:use-module (guix utils)
+  #:use-module (guix store)
+  #:use-module (guix hash)
+  #:use-module (guix base32)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:export (gnu->guix-package))
+
+;;; Commentary:
+;;;
+;;; Generate a package declaration template for the latest version of a GNU
+;;; package, using meta-data available upstream for the package.
+;;;
+;;; Code:
+
+(define (file-sha256 file)
+  "Return the SHA256 hash of FILE as a bytevector."
+  (call-with-input-file file port-sha256))
+
+(define (qualified-url url)
+  "Return a fully-qualified URL based on URL."
+  (if (string-prefix? "/" url)
+      (string-append "http://www.gnu.org" url)
+      url))
+
+(define (preferred-archive-type release)
+  "Return the preferred type of archive for downloading RELEASE."
+  (find (cute member <> (gnu-release-archive-types release))
+        '("xz" "lz" "bz2" "tbz2" "gz" "tgz" "Z")))
+
+(define* (gnu-package->sexp package release
+                            #:key (key-download 'interactive))
+  "Return the 'package' sexp for the RELEASE (a <gnu-release>) of PACKAGE (a
+<gnu-package>).  Use KEY-DOWNLOAD as the OpenPGP key download policy (see
+'download-tarball' for details.)"
+  (define name
+    (gnu-package-name package))
+
+  (define url-base
+    ;; XXX: We assume that RELEASE's directory starts with "/gnu".
+    (string-append "mirror:/" (gnu-release-directory release)
+                   "/" name "-"))
+
+  (define archive-type
+    (preferred-archive-type release))
+
+  (let ((tarball (with-store store
+                   (download-tarball store name
+                                     (gnu-release-directory release)
+                                     (gnu-release-version release)
+                                     #:archive-type archive-type
+                                     #:key-download key-download))))
+    `(package
+       (name ,name)
+       (version ,(gnu-release-version release))
+       (source (origin
+                 (method url-fetch)
+                 (uri (string-append ,url-base version
+                                     ,(string-append ".tar." archive-type)))
+                 (sha256
+                  (base32
+                   ,(bytevector->base32-string (file-sha256 tarball))))))
+       (build-system gnu-build-system)
+       (synopsis ,(gnu-package-doc-summary package))
+       (description ,(gnu-package-doc-description package))
+       (home-page ,(match (gnu-package-doc-urls package)
+                     ((head . tail) (qualified-url head))))
+       (license find-by-yourself!))))
+
+(define* (gnu->guix-package name
+                            #:key (key-download 'interactive))
+  "Return the package declaration for NAME as an s-expression.  Use
+KEY-DOWNLOAD as the OpenPGP key download policy (see 'download-tarball' for
+details.)"
+  (match (latest-release name)
+    ((? gnu-release? release)
+     (let ((version (gnu-release-version release)))
+       (match (find-packages (regexp-quote name))
+         ((info . _)
+          (gnu-package->sexp info release))
+         (()
+          (raise (condition
+                  (&message
+                   (message "couldn't find meta-data for GNU package"))))))))
+    (_
+     (raise (condition
+             (&message
+              (message
+               "failed to determine latest release of GNU package")))))))
+
+;;; gnu.scm ends here